Arduino IDE always shows /dev/ttyS4

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I’m on Ubuntu 20.04.1 and I just installed Arduino IDE. I always worked on Arduino via Ubuntu via Virtual Machine so this is my first time on “phisical” Ubuntu.
Even without my UNO connected, in Tools->Port it always shows me “/dev/ttyS4” and I can’t understand why.
When my UNO is connected, it shows me correctly /dev/ttyUSB0 but also this ttyS4.
Can anyone explain me this please? I’m on Asus Vivobook S15 – i7 8th.
EDIT: my friend with Huawei Matebook (Ryzen ed) doesn’t have this issue.
Sorry for my English, this is not my native language.

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